<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
    <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!--用户名-->
        <el-form-item prop="username" >
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login()">登录</el-button>
          <el-button type="info" @click="resetLoginForm()">重置</el-button>
        </el-form-item>

      </el-form>
    </div>
  </div>
</template>

<script>
    export default {
      data(){
        return {
          // 这是登录表单的数据绑定对象
          loginForm: {
            username:'admin',
            password:'123456'
          },
          // 表单验证规则对象
          loginFormRules:{
            // 验证用户名是否合法
            username:[
              { required: true, message: '请输入登录名称', trigger: 'blur'},
              { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
            ],
            // 验证密码是否合法
            password:[
              { required: true, message: '请输入登录密码', trigger: 'blur'},
              { min: 6, max: 15, message: '长度在 6 到 10 个字符', trigger: 'blur' }
            ]


          }
        }
      },
      methods:{
        // 点击重置按钮,重置登录表单
        resetLoginForm(){
          this.$refs.loginFormRef.resetFields();

        },
        login(){
          this.$refs.loginFormRef.validate(async valid =>{
            if (!valid){
              // 判断valid是否为false，若为false则不执行请求
            } else {
              const {data: res} = await this.$http.post('login',this.loginForm);
              // 1. 将登录成功之后的token，保存到客户端的sessionStorage中
              // 1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
              // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
              window.sessionStorage.setItem('token',res.data.token);
              // 2.通过编程式导航跳转到后台页面，路由地址是/home
              await this.$router.push('/home')
              if (res.meta.status!==200){
                return this.$message.error('登录失败');
              } else {
                return this.$message.success('登录成功');
              }
            }
          });
        }
      }
    };
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);

  .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%,-50%);
      background-color: #fff;
  img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .btns{
      display: flex;
      justify-content: flex-end;
    }
    .login_form{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;

    }

  }

</style>
